Stock Photo - MOUNT WHITNEY, CA - JUNE 30: Hikers rest after a strenuous climb on June 30, 2010, on the summit of Mount Whitney. In 2009 ca. 25,000 people summited the highest peak in the continental United States.

MOUNT WHITNEY, CA - JUNE 30: Hikers rest after a strenuous climb on June 30, 2010, on the summit of Mount Whitney. In 2009 ca. 25,000 people summited the highest peak in the continental United States.

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